Optical design, performance, and tolerancing of an Offner imaging spectrograph

Hana Ku; Seo Hyun Kim; Hong Jin Kong; Jun Ho Lee

doi:10.1117/12.929483

15 October 2012 Optical design, performance, and tolerancing of an Offner imaging spectrograph

Hana Ku, Seo Hyun Kim, Hong Jin Kong, Jun Ho Lee

Proceedings Volume 8491, Optical System Alignment, Tolerancing, and Verification VI; 84910K (2012) https://doi.org/10.1117/12.929483
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

We introduce a design of an Offner imaging spectrograph with its performance and tolerancing results. It is a traditional Offner spectrograph employing two concave mirrors and one convex reflective grating for dispersing light in the SWIR band (900~1700 nm). The optical system uses 25um-pitch pixels for the detector and the goal spectral sampling is 3.2nm. Its performance is analyzed in terms of MTFs, spot diagrams, and distortions – keystone and smile. This design focuses on the yaw(beta-tilt) sensitivity of the tertiary mirror as the compensator hence is expected to act as a performance-improving breakthrough for the entire system as the inverse sensitivity confirms it is the most sensitive component. The procedure of the inverse sensitivity evaluation is explained, and then budgeting the tolerances for each element for the practical production is described.

Citation Download Citation

Hana Ku, Seo Hyun Kim, Hong Jin Kong, and Jun Ho Lee "Optical design, performance, and tolerancing of an Offner imaging spectrograph", Proc. SPIE 8491, Optical System Alignment, Tolerancing, and Verification VI, 84910K (15 October 2012); https://doi.org/10.1117/12.929483

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